回发后动态网格视图失去绑定？ [英] dynamic grid view loses binding when post back occurs ?

问题描述

我有一个动态网格视图，其中模板字段和绑定字段为列



第一页加载所有绑定看起来很好。所有列中都填充了值



当我触发一个事件，例如列标题中存在的下拉列表中更改的选定索引（内部模板字段）时，绑定将丢失，并且事件永远不会被捕获。



如何在发回邮件时保留控件以及如何解决这个问题？

这是我的代码

I have a dynamic grid View with template fields and bound fields as columns

for the first page load all binding looks fine.values are populated in all columns

when I trigger an event such as selected index changed in Drop downlist present in the column header(inside template field ) the binding are lost and the event is never catched.

how to retain controls when post back occurs and how to resolve this problem ?
this is my code

private void Subjectbind(string ExamYear, string ExamType)
{
 
if (ddlExamYear.SelectedIndex == 0)
ExamYear = ddlExamYear.SelectedValue;
if (ddlExamType.SelectedIndex == 0)
ExamType = ddlExamType.SelectedValue;
 


 
List lstCourses =
objMDLClass.GetAllExamTypeCourses(Convert.ToInt32(ExamType),
ExamYear);
objManage = new StudentManage((Users)Session["user"]);
 

foreach (SpGetExamTypeCourses_Result objCourse in lstCourses)
{
 
GridTemplateColumn col = new GridTemplateColumn();
col.UniqueName = objCourse.CourseId.ToString();
col.HeaderText = objCourse.CourseName;
col.ItemTemplate = new GridCustomItemTemplate(objManage.GetExamAnalysisReport(
Convert.ToInt32(objCourse.CourseId), Convert.ToInt32(ExamType),
ExamYear));
 

 
gvSubwisePerformance.MasterTableView.Columns.Add(col);
 
}
gvSubwisePerformance.Rebind();
}

推荐答案

仅当Page_Load不是回发时才绑定gridview上的gridview。

查看此内容： gridview在分页时丢失动态创建的模板列 [ ^ ]

Bind the gridview on Page_Load only if it is not a postback.
Check this out: gridview loses dynamically created template column when paging[^]

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